adds link to the "Angular-Buch" (#304)
adds link to the "Angular-Buch" (#304)

Adds a link to the website of our book. Many thanks for reviewing this.
Warning: I'm affiliated with the website. I wrote the book. :innocent:
AngularClass/awesome-angular,AngularClass/awesome-angular2,angular-class/awesome-angular2,AngularClass/awesome-angular2,AngularClass/awesome-angular